Siemens SINUMERIK 828D Function Manual page 350

G2: Velocities, setpoint / actual value systems, closed-loop control
7.3 Metric/inch measuring system
CAUTION
The FGREF factor also works if only rotary axes are programmed in the block. The normal F
value interpretation as degree/min applies in this case only if the radius reference
corresponds to the FGREF default:
• For G71/G710: FGREF[A]=57.296
• For G70/G700: FGREF[A]=57.296/25.4
Example
The following example is intended to demonstrate the effect of FGROUP on the path and path feedrate. The
variable $AC_TIME contains the time of the block start in seconds. It can only be used in synchronized actions.
Program code
N100 G0 X0 A0
N110 FGROUP(X,A)
N120 G91 G1 G710 F100
N130 DO $R1=$AC_TIME
N140 X10
N150 DO $R2=$AC_TIME
N160 X10 A10
N170 DO $R3=$AC_TIME
N180 A10
N190 DO $R4=$AC_TIME
N200 X0.001 A10
N210 G700 F100
N220 DO $R5=$AC_TIME
N230 X10
N240 DO $R6=$AC_TIME
N250 X10 A10
N260 DO $R7=$AC_TIME
N270 A10
N280 DO $R8=$AC_TIME
N290 X0.001 A10
N300 FGREF[A]=360/(2*$PI)
N310 DO $R9=$AC_TIME
N320 X0.001 A10
N330 M30
350
Comment
; Feedrate = 100mm/min or 100 degrees/min
; Feedrate = 100 mm/min, path = 10 mm, R1 = approx.
6 s
; Feedrate = 100 mm/min, path = 14.14 mm, R2
= approx. 8 s
; Feedrate = 100 degrees/min, path = 10 degrees, R3
= approx. 6 s
; Feedrate = 100 mm/min, path = 10 mm, R4 = approx.
6 s
; Feedrate = 2540 mm/min or 100 degrees/min
; Feedrate = 2540 mm/min, path = 254 mm, R5
= approx. 6 s
; Feedrate = 2540 mm/min, path = 254.2 mm, R6
= approx. 6 s
; Feedrate = 100 degrees/min, path = 10 degrees, R7
= approx. 6 s
; Feedrate = 2540 mm/min, path = 10 mm, R8 = approx.
0.288 s
; Set 1 degree = 1 inch via the effective radius.
; Feedrate = 2540 mm/min, path = 254 mm, R9
= approx. 6 s
Function Manual, 09/2011, 6FC5397-0BP40-2BA0
Basic Functions